. >> today, we mourn four more americans who represent the very best of the united states of america. we will not waiver in the commitment to see justice is done. make no mistake, justice will be done. >>> meanwhile, we are learning more about the attack. melissa is live with more. >> hey, keith. since the deaths, the president ordered increased security. as many as 200 marines could be sent to libya to bolster security. >> 52-year-old jay christopher steven z was a career diplomat. he was assigned earlier this year. he served two tours in libya running the office in benghazi against gadhafi. he once worked as an international trade here in washington. a large mob stormed the consulate with automatic weapons firing at the building before burning it to the ground. stevens was found in a small room where he was taking cover. he and three others killed after they came back to help with evacuations. neighboring egypt scaled the walls, tearing down and burning the american flag. libyan officials held a press conference earlier today. >> we have been looking into this matter seriously since